NUMBER6 PISTON ALSO IN top dead centre
The top dead center is when the piston has reached its peak and can go no farther up, it has reached its summit. The bottom dead center is when the piston is at its lowest point.
Take number 1 plug out, put your finger in the plug hole turn motor over manually preferably, when piston is at top dead center it will blow air out of number 1 hole.
The piston will usually be a few degrees before top center.
Top dead center on an engine is defined as when the piston is farthest from the crankshaft. Bottom dead center is when the piston is closest to the crankshaft on the engine.
TDC is top dead center it pretains to the position of the pistons. The number one piston has to be TDC when you put on the timing chain or belt for it to work properly.
The distance from Top Dead Center to Bottom Dead Center of piston movement.
TDC is 0 degrees TDC, not 10 degrees BTDC which is before top dead center. ATDC is after top dead center. Both of these in relation to piston height are "below top dead center".
Measure the distance a piston travels from bottom dead center to top dead center.
The distance from Top Dead Center to Bottom Dead Center of piston movement.
0
Top dead center. It is when a piston is at its highest position.
the piston in cylinder #1 at the top on the compression stroke